Tobacco pipe



1934- E. H. M ARDLE 1,970,386

TOBACCO PIPE Filed April 21, 1933 1 iii: WWI/ll/AV/lli/iiibW/IM EdWard H. McAkd I INVENTOR ATTORNEY Patented Aug. 14, 1934 T B QT E f 'EdwardflrMcArdle,Elizabeth,N. J.

Application" April" 2 1, 193:, Sam. N5. 1567.138

4 '(llaimsbulCl. 131-12) V My invention relates generally to tobacco pipes and is more specifically directed to a smoke cooling and moisture removing unit adapted tobe interposed between the pipe bowl and abit or I .5 mouth piece in the smoke passage of the pipe.

, The primary purpose-oi av unit of this .kind, many forms of which are known tothe art, is to cool the smoke and.v remove objectionable constituents therefrom so that the smoke is .cool, '10 relativelyv dry and sweet, when it reachesthe smokers mouth. i I r "Certain of the prior constructions have achieved these desiderata to a limited extent, but sofar as I am aware none has been wholly satisfactory,

'15; and the principal object of my invention fis to provide a unit of this general character by means of which a maximum of coolness, drynessfland sweetness of the smoke drawn into the smokers mouth isobtained. j l

I accomplish this object by a construction of the unit such that two distinct temperature zones or areas are created about the unit, the zonenear thepipe bowl being the hot zone and thatfnear the bit being the cool zone. The preferred struc ture includes a front cup or tube of' relatively substantial' capacity in which considerableturbulence of the smoke may'occur', a 'connect'ing 'or intermediate rod of very small cross sectional area as compared-with the cross sectional area of the cup or tube, and a rear adapter which is also preferably of general tubular construction but of less capacity than the front cup or tube.

The invention is illustratively exemplified in the accompanying drawing in which Fig. 1 is an elevational view, partly in section, of a smoking 540 a still further modified form of unit; and Fig. 5

is a cross section on the line 5-5 of Fig. 2.

The unit of my invention is usable in most forms of tobacco pipe, that shown in the drawing comprising a bowl 10, a bowl stem or shank 11 communicating by a short duct 12 with the bowl,

and a bit 13 having a tenon 14 engaging an undercut seat 15 at the rear of the bowl stem. The bowl stem also has the usual bore or chamber 16 of substantial internal diameter.

structurally, my improved unit is desirably an integral body and comprises a cup or tube 17 having an open end in close proximity to the outlet end of the duct 12, a solid shank or connecting rod 18 extending lengthwise within the chamber 16, and an adapter 19 having a tubular extension 20 projecting into a countersunk seat 2 11in'the smoke passage 13% of the bit.. The-rear, wall of vthe cup :17 is providedwith an outlet orifice 22 and the. adapter 19 and. its extension 20 are provided with the passages 23 and 24; at a suit,- able angle to each other. i Proper dimensioning of the several parts of the'improved unit is an important factor inobtaining best results, although I desire to make it clear that my invention is not restricted to any absolute or relative dimensions of parts. It has been found in practice that if the average cross sectional area of the shank l8 throughout its entire length is' less than oneninth the cross sectionalarea of the chamber '16 in which the unit is mainly lodged so little heat will be transferred from the cup" 17 to the adapter 19 that the rear emi 'e., the end near the smokers "mouth,of the pipe is maintained cool'throughout the smok ing of theaverage pipeful oftobacco. I [The cupfl'l is'desirably in the form of a cyli'n' der whose wall is at least twomillimete'rS in length along the shank bore 1 6 of the I pipe and ivhich is fairly closely fittedinto the'pipe shank.

cup is'well' hollowed out to present alarge surface and the orifice 22 is relatively small to allowforgthe'passage of smoke. Under, these'con ditions," excellent turbulence of tobacco "smoke flow through thecup 17 is obtained with result ing excellent heat transfer and excellent cooling or shock chilling in the immediate environs of the cup; therefore considerable moisture condensation takes place in the immediate forward end temperature zone, even when the cup is used in conjunction with a thin connector rod as described above. In other words, while preventing excessive moisture condensation on the thin connector rod 18, and also while keeping the rear or adapter end of the unit cool by the creation of two separate temperature zones, a well hollowed out cylindrical forward end will still condense out ample bitter tasting moisture to provide a cool sweet and enjoyable smoke, and perform this condensation at a point the farthest possible distance I away from the mouth.

The smoke is shock chilled and most of the moisture is condensed just after leavingthe pipe bowl 10, which is as it should be.

As intimated above, the ideal average cross sectional area of the rod 18 is one which will be as small as possible to prevent appreciable heat transfer through the rod from the forward end of the cup 1'7 and at the same time large enough to provide ease and safety in fabrication and use. The above noted area, viz., lessthan one 1-1 ninth that of the shank bore corresponds with a ratio of diameters of bafile to average of rod, of more than three to one.

The wall length of the cup 1'1 should exceed two millimeters in order to effectively prevent minute tobacco flakes from slipping by in case too much clearance of the cup from the shank bore occurs. The length should be less than that of the rod 18 to allow for a long thin slight heat conducting rod in the space allowed forinstallation of the unit. The length of the cup 17 need not exceed eight to ten millimeters in the average size pipe,

provided enough of the cup is hollowed out to make the metallic surface presented to the smoke oncoming from the pipe bowl at least double that of the cross sectional area of 'thefshank. bore.

This is ample to provide for a highly turbulent smoke flow through the hollowed out cylinder and therefore for the thorough smoke cooling. and

moisture condensation in the immediate vicinity of the'cup;

Figure 3 discloses a modified form'of unit in which the entire structure is somewhat heavier than that shown in Fig. 2. The cup 17 issomewhat elongated and relatively'thick walled;the rod 18 is properly proportioned'to the size, of the cup and the adapter with its passages 23' and 24 is likewise proportioned to the other elements of the unit. Thecup" 1'7 is provided with the smoke outlet orifice 22. J

The modification of Fig. 4 discloses a thin walled cup 1'7 shorter than'either the cup 17 or 17, a connecting rod 13 and adapter 19 having the passages 23 and 24 In smoking a pipe containing a unit such as that described above, the hot smoke issuing from the bowl 10 and reaching the cup 1'7 has relatively great turbulence imparted to it, thus causing very pronounced cooling and the condensation of moisture as well as'precipitation of solids or semi-solids. "The smoke, thus pre-cooled and sweetened, flows through the orifice 22 into and through the chamber 16 to the relatively offset A passages 23 and 24 where additional cooling and purification are effected.

When the smoke reaches the smokers mouth through the bit 13 it is cool and sweet, free of all or substantially all its objectionable constituents.

ing lengthwise within the chamber in the bowl stem and an adapter in proximity to the bit.

2.. Ina tobacco pipe comprising a bowl, a chamberedbowl stem and a passaged bit, the combination therewith of a smoke cooling and moisture .removingunitcomprising an elongated cup member having an open end adjacent the pipe bowl and arestricted smoke outlet orifice in the wall constituting its opposite end, an intermediate connecting rod whose average cross-sectional area throughout its length is less than one ninth the cross-sectional area of the chamber in the bowl stem, and an adapter in proximity to the bit.-

3. A' smoke cooling'and'moistureremoving unit for tobacco pipes comprising as an integral structure a cup having one end completely open and having a restricted orifice in the wall constituting the opposite end, a thin intermediate solid connecting rod and an adapter having an angular passage therethrough, the cup being'at one'end of said rod and the ad'apter at the other end.

thereof.

Y 4. In a tobacco pipe comprising a bowl, a chambered bowl stemand a passaged bit, the combination therewith of a smoke cooling unit comprising acylindrical cup having a wall length not less than 2 millimeters and having one endc'ompletely open in close proximity to the bowl and the wall on the other end provided with a restricted orifice, an intermediate solid rod having an average cross sectional jareathroughout its length of less than one ninth the cross sectional area of the chamber in the bowl stem and an adapter having atubular projection with'passages at an angle to each other through the adapter and through the tubular projection. v

' I EDWARD H. MCARDLE.

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